Abstract: A torsion damper in the form of a clutch friction disc comprises two guide washers bearing first elastic members mounted with clearance in recesses in a wheel disc, and second elastic members interposed circumferentially between reaction plates and the wheel disc. Friction elements intervene between the guide washers and the plates. The second elastic members are fitted radially beneath the first elastic members while the friction elements axially urge the plates towards the wheel disc and comprise on one side of the wheel disc a first elastic washer and a first friction washer in contact with a reaction plate, and on the other side of the wheel disc, a second friction washer in contact with a reaction plate and a third friction washer engaging the first elastic members. The invention is particularly applicable to torsion damping friction discs for use in automobile clutches.

Abstract: A torsional damper device comprises an intermediate member responsive to centrifugal force. At low values of torque, beyond a predetermined critical rotation speed, it causes to become operative an elastic intermediate member which is normally inoperative at such low values of torque. This intermediate member comprises at least one flange which, by way of a toothed portion, is selectively interlocked with the hub. By way of a bearing lug, it is adapted to act on the elastic member concerned.

Abstract: A clutch cover assembly suitable for automotive vehicles comprises a generally annular cover by means of which it is adapted to be attached to a reaction plate or flywheel. It further comprises a generally annular pressure plate which is constrained to rotate with the cover but movable relative to it in the axial direction. Elastic means in the form of a diaphragm spring bear on the cover to exert an axial force on the pressure plate through a bearing member. The bearing member is centered on the diaphragm spring by axial lugs which engage in notches provided on the diaphragm spring for this purpose. The bearing member carries a progressively acting spring washer.